The story begins when the goddess Rista summons a hero to help her hard mode video game-like world. The hero, Seiya, is exceptional in every way, but he is incredibly cautious. He does things like buy three sets of armor (one to wear, a spare, and a spare for the spare) and go full power against weak slimes (just in case).

Tsuchihi launched the novel series on the Kakuyomu website in June 2016, and Kadokawa published the first volume in print with illustrations by Saori Toyota in February 2017. The fifth volume shipped last November. Yen Presslicensed the novels, and shipped the first volume on June 18.